- Hardness Test Should Be Started From The Least hard Pencil.
- Start From Smaller Number Softer To Harder Pencil TO Leave Only ONE Scratch.
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DURABILITY OF GEMS MATERIALS DURABILITY is combination of three parameters. HARDNESS: Resistance to Scratching TOUGHNESS: ... -
Unit Of Weight * Gems Are Mearured In Carat * It Is Denoted By (CT) The Name Of Carat Is Derived By Carob Three. Each Can't Is Sp...
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